Drag-saw



(ModeL) O. THOMPSON.

DRAG SAW.

Patented Jan.23,1883.

ATTORNEYS.

WITNESSES IJ'MTED STATES PATENT OFFICE.

CHARLES THOMPSON, OF CORVALLIS, OREGON.

DRAG-SAW.

SPECIFICATION forming part of Letters Patent No. 271,159, dated January23, 1883 Application filed August :26, 1882. (ModeL) '10 use the powerof his weight on the treadles and of his hands on the hand-lever forworking the saw in one direction, and the power of his weight on theseatlever and of his hands on the hand-lever for working the saw in the1 reverse movement, thus enabling a greater exercise of power than isafforded by other machines; and the invention also consists of acontrivance of the seat for greater comfort of the operator, all ashereinafter fully described.

Reference is to be had to the accompanying drawings, forming part ofthis specification, in which similar letters of reference indicatecorresponding parts in both the figures.

Figure 1 is a perspective view of my im- 2 proved sawing-machine, andFig. 2 is a detail of the log-fastening devicein section.

For mounting the saw and the working-levers I employ a frame consistingof posts a and horizontal beams 11, together with a base,

c, or not, as preferred, the beams being attached at one end to theposts, and at the other end having an adjustable stay-post, d, and foot6 for resting on and securing the log f y a g 9- The saw it has arigidly-attached shank, i,

which is pivoted to the lower end of a working-lever, j, which has itsfulcrum on a rod, is, mounted in the posts a at the top. Thisworking-lever has the hand-lever l, pivoted to its .upper end, and saidhand-lever has its fulcrum on the end of the bar m, which is pivoted tothe frame at 0 to enable the fulcrum of the hand-lever to vibrate as theswing of the working-lever demands.

The seat-lever, which consists of the two parallel bars, 19, cross-barq, and seat 9", is pivoted to the posts a at 8 below the fulcrum-rod kof the working-lever, with theseat projecting rearwardly from said postssuitably for 0 the operator sitting thereon to work the handlever, andalso to work'foot-levers t, pivoted to the frame at a, and arranged withrelation to the seat and the seat-levers, as shown, whereby the operatormay apply his feet to the footpieces 2:, rigidly attached to levers t,said levers being connected to the seat-levers p by the rods 20 and thebrackets w, and the seat-levers being connected to the working-leverj bythe bar 3 and bracket 2, so that when the operator shifts his weightfrom the seatto the foot-leto vers he may also pull on the hand-lever,and thus apply both powers for pulling the saw back, and whentransferring his weight to the seat he may at the same time push on thehand-levers, and thus employ both of these- 6 powers for thrusting thesaw forward. The hand-lever working both ways, together with theseat-lever working one Way and the footlevers working the other way toimpel the saw, thus enables two powers to apply to the saw each way, bywhich the operator may exercise a greater amount of force by a givenamount of effort than with other arrangements.

I employ the parallel bars 1) and cross-bar q for the seat-lever inorder to arrange the seat 7 5 between them for enabling the operator towork between them with more comfort than he can astride of a singlelever, and I pivot the seat in said bars at a rather than attach itrigidly,

so that it can vibrate, and thus maintain the best relations to theoperator for his comfort.

The leg 01 is adjustable vertically in the frame b, for; shifting it upand down to suit the height of thelog f, and is provided with aset-screw,

b, for securing it in position. 8

Braces b may be employed to connect posts a and beams b for increasedstrength, and the seat-bars 10 have a series of holes, of, in anyopposite pair of which the seat-pivots a may be secured to adjust theleverage of the rock- 0 ing seat to suit the weight and strength ofdifferent operators.

Havingthus described my invention, Iclaim as new and desire to secure byLetters Patent- 1. In a sawing-machine, the saw it, with its 5 shank 6,connected to the lever j, secured to a shaft near its upper end, saidshaft bearingin the supporting-frame, the hand-lever i, connected to thelever j, and the link or bar m, connectin g the hand lever l to thesupporting- Ice 2 amuse frame, in combination with the seat-lever p q,having the hand-lever l, the link or bar m,conconnected to the leverj bythe link '2 and the necting the lever l to the frame, the seat-leverfoot-levers tv, suspended from the supportingp q, connected to the leverZby the link 3 and frame and connected to the seat-lever by thethefoot-leverstv,suspended from the frame and 5 rods 20 w, substantiallyas and for the purpose connected to the seat-levers by the rods to w, 15set forth. i. substantially as and for the purpose set forth. 7

2. In a sawing-machine, the combination of CHARLES THOMPSON.

the frame a b, having at its rear end the stay Witnesses: d, providedwith the dog g, saw h, connected ROBERT JOHNSON,

IO to the leverj, pivoted in the said frame, and JOHN B. HORNER.

